Hemangioma
Intravascular papillary endothelial hyperplasia. The confinement of the lesion to the vascular lumen and the hyaline core of the papillae are characteristic features.

Source: Rosai: Surgical Pathology 9th edition
Intravascular papillary endothelial hyperplasia. The confinement of the lesion to the vascular lumen and the hyaline core of the papillae are characteristic features.

Source: Rosai: Surgical Pathology 9th edition